Problem Solved: What is a typical compression reading for a stock SHO?

What kind of hot compression readings are people getting?

Edit: Thanks to everyone that contributed their ideas and compression numbers. As it turned out the gauge was OK but the Schrader valve in the hose was either too stiff or gummed up a little. I put a new softer valve in and everything works fine. I have 125# in all four cylinders. At least one mechanic told me that the valve is different for smaller engines than large V8s. I may have had the right valve for a V8 but not an SHO.

That's more what I would expect. I did a baseline check on my 2008 SHO at 130hours last fall before I made a number of mods over the winter. The gauge I have read 65# cold last fall and about the same when I ran it this spring and checked it warm. Assuming my gauge is correct 65# seems pretty bad for 130hours?

That's more what I would expect. I did a baseline check on my 2008 SHO at 130hours last fall before I made a number of mods over the winter. The gauge I have read 65# cold last fall and about the same when I ran it this spring and checked it warm. Assuming my gauge is correct 65# seems pretty bad for 130hours?

65 is very low but if all 3 read that low i would try a different gauge, Sounds like a gauge may be bad.

65 is very low but if all 3 read that low i would try a different gauge, Sounds like a gauge may be bad.

I checked the gauge and it seems ok. Certainly not off 2 to 1. Is there any trick to checking compression on a supercharged motor? I hold the throttle open so it won't pump fuel and send a spark but with throttle by wire is the throttle plate really open?